#include<stdio.h>
int main()
 {
     int l=n1;
     int b=n2;
     int h=n3;
     
     scanf("%d",&n1);
     scanf("%d",&n2);
     scanf("%d",&n3);
     if (n1==n2&&n2==n3&&n1==n3)
     {
         printf("Equilateral");
     }
     if (else n1==n2)
     {
         printf("Isoceles");
         
     }
     else 
     {
         printf("scalene");
         
     }
     if (n1<=0;n2<=0;n3<=0)
     {
     printf("Invalid input");
     }
     return 0;
 }